O.S. Engines 55AX - Manual (Page 19)

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Symptom Factor Cause Corrective action
2
3
1
2
3
3
3
3
2
Voltage too high or too low. Re-check and readjust referring to "BEFORE
STARTING" .
Continue applying an electric starter. If the engine dos not start after more
than 4 tries, disconnect the current to the glowplug and leave for a few
minutes., then re-energize plug and apply starter. If the engine still does not
start, remove glowplug and pump out excess fuel by applying the starter.
Then re-start. (Priming is not necessary.)
Recharge the electric starter battery.
Recharge lead-acid cell or replace dry battery.
(Note: An unused, or almost unused, dry battery may sometimes be of
insufficient capacity if it is "old stock".)
Repeat priming procedure referring to Priming.
Close needle-valve half turn (180 ) and wait for several minutes then re-
start.(Priming is not necessary.)
Make sure that tank is filled with fuel. Check that there is not something
wrong with the fuel line (kinked or split). Check that carburettor is not
clogged with dirt.
Close the needle-valve a little before disconnecting current to the glowplug.
Change fuel or glowplug.
Incorrect heating of
glowplug.
Over priming.
Sluggish rotation.
Glowplug battery
discharged.
Insufficient priming.
Mixture too rich.
Fuel not reaching the
engine.
Mixture too rich.
Mismatch of glow plug and
fuel.
Engine fires
intermittently but
does not run.
Engine fires once
or twice, then
fails to fire.
Engine starts but
rpm decreases
and engine eventually
stops.
Engine starts,
rpm increases
and engine cuts
out.
Engine stops when
the current to the
glowplug is discon-
nected after starting.
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CARE AND MAINTENANCE
Please pay attention to the matters
described below to ensure that your engine
serves you well in regard to performance,
reliability and long life.
As previously mentioned, it is vitally important
to avoid operating the engine in conditions
where dust, disturbed by the propeller, may
be deposited on the engine and enter its
working parts.
Remember to keep your fuel container
closed to prevent foreign matter from
contaminating the fuel.
Install a fuel filter to prevent dirt and dust in
the fuel container from entering the fuel tank.
O.S. Super Filters (L) and (S) are available
as optional extras.
Install an in-line fuel filter between the tank
and carburetor to prevent dirt and dust in the
tank from entering the carburetor.
If these precautions are neglected, restriction
of fuel flow may cause the engine to cut out,
or the fuel/air mixture to become too lean
causing the engine to overheat.
Clean these filters periodically.
The use of modern high-performance alcohol
based model engine fuels, while promoting
cooler running, improved anti-detonation
combustion and increased power, have the
disadvantage of causing corrosion due to the
acid by-products of combustion. The use of
nitromethane in the fuel can also contribute
to the problem.